Rabail

Full Stack AI Developer

Definity • Freelance

Jan 2025 - Aug 2026 • 1 yr 7 mos

I build mobile apps and the systems behind them, working across the full stack rather than handing off at the API boundary. Day to day this means React Native for iOS and Android, Node.js and Express for the backend, MongoDB for data, and React for the web dashboards that manage it all. I take products from an empty repository through to App Store and Play Store approval, which means I deal with the parts most developers avoid: build failures, native module linking, iOS signing and provisioning, store review rejections, and the gap between working locally and working in production. Recent work has focused on real-time systems and AI. That includes in-app voice and video calling, inbound voice AI agents built on Vapi and Twilio that answer calls and book appointments, LLM integration inside mobile products, and automated backend workflows. I also spend a large share of my week reviewing other developers' code and resolving issues in codebases I did not write. That has made me faster at working in unfamiliar projects than at greenfield builds, which is usually what clients with an existing app actually need. What I bring beyond writing code: I will tell you when a problem is structural rather than a bug, and when a scope does not fit a budget, instead of taking the work and missing the deadline.